package com.king.netty.simple;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;

/**
 * @author unidentifiable
 * @date 2021/2/7
 */
public class NettyClientHandler extends ChannelInboundHandlerAdapter {

    /**
     * 通道就绪 触发点
     * @param ctx 上下文对象
     * @throws Exception
     */
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("client" + ctx);

        ctx.writeAndFlush(Unpooled.copiedBuffer("Hello, server: ", CharsetUtil.UTF_8));

//        super.channelActive(ctx);
    }

    /**
     * 通道读取事件 触发点
     * @param ctx
     * @param msg
     * @throws Exception
     */
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf buf = (ByteBuf)msg;
        System.out.println("服务器回复的消息：" + buf.toString(CharsetUtil.UTF_8));
        System.out.println("服务器地址：" + ctx.channel().remoteAddress());
//        super.channelRead(ctx, msg);
    }

    /**
     * 异常处理
     * @param ctx
     * @param cause
     * @throws Exception
     */
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.close();
//        super.exceptionCaught(ctx, cause);
    }
}
